<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"> 
	<title>Bootstrap 实例 - 基本的按钮组</title>
	<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">  
	<script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
	<script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
	<button type="button" class="btn btn-default">默认</button>
    <div class="btn-toolbar" role="toolbar">
            <div class="btn-group  btn-group-lg">
                    <button type="button" class="btn btn-default">按钮1</button>
                    <button type="button" class="btn btn-default">按钮2</button>
                    <button type="button" class="btn btn-default">按钮3</button>
            </div>
            <div class="btn-group  btn-group-sm">
        <button type="button" class="btn btn-default">按钮1</button>
        <button type="button" class="btn btn-default">按钮2</button>
        <button type="button" class="btn btn-default">按钮3</button>
              </div>
              <div class="btn-group btn-group-xs">
                    <button type="button" class="btn btn-default">按钮1</button>
                    <button type="button" class="btn btn-default">按钮2</button>
                    <button type="button" class="btn btn-default">按钮3</button>
                    <div class="btn-group">	<button type="button" class="btn btn-default">默认</button>
                        <button type="button" class="btn btn-btn-default dropdown-toggle  btn-lg " data-toggle="dropdown">
                            默认
                            <span class="caret"></span>
                        </button>
                        <ul class="dropdown-menu">
                            <li><a href="#">下拉链接1</a></li>
                            <li><a href="#">下拉链接2</a></li>
                        </ul>

                    </div>
                </div>
    </div>

</body>
</html>